DTDC Courier & Cargo — Not delivered yet my original documents

Address:

IIT Madras.

The courier was sent from Rajahmundry on 10th Dec 2022. The courier contains my original documents and certificates. It has reached Chennai on 13th. Yet it has not delivered to me, with location being IIT Madras. I raised a query yesterday night. No response. I spoke with customer care in the morning. Received no response. I spoke with the customer care again in the afternoon. They said there was some network issue on their side and can't track complaint. It's absolutely pathetic service. They are cheating the customers. I want to appeal it in strongest way possible. In the process, I am writing here.
Consignment number is H70320668.